To assess whether a machine works well, the mean of the filling quantity and the spread of the filling quantity are considered. A machine works better the closer the filling is on average to the value 330 ml and the smaller the spread is.
For the sample from Machine $A$, the mean of the filling quantity is 330 ml and the standard deviation is approximately $1.34 \mathrm { ml }$.
Investigate based on the samples which of the two machines works better.